Double Bell BY-811 HK416 Short AEG 6mm - Metal Black Airsoft Replica

Double Bell BY-811 : AEG HK416 short metallic

The Double Bell BY-811 is an airsoft electric replica of the HK416 short, 6mm caliber, designed for players seeking a solid construction and reliable field performance.

Its metallic body, V2 gearbox, and Quick Spring Change system make it a serious technical base for beginners or advanced airsoft players.

Detailed specifications

• Propulsion type : Electric AEG — battery-powered (not included), offers repeated fire without manual effort between each pellet
• Firing modes : Safety / Semi-automatic / Automatic — standard M4 side selector switch
• Initial velocity : 380 FPS with 0.20g pellet — power certified for most outdoor fields
• Caliber : 6 mm
• Internal barrel : 6,02mm diameter (tight bore), length 290mm — increased accuracy compared to a standard 6.08mm barrel
• Gearbox : Version 2 (V2), 7mm steel ball bearings — enhanced mechanical robustness
• Quick Spring Change (QSC) system : Quick adjustment of power without gearbox disassembly
• Hop-up : Rotating polymer chamber — backspin effect adjustment via functional bolt-catch
• Magazine : 300-bullet high-capacity steel included
• Materials : Body, external barrel, handguard and receivers in metallic alloy / Stock and pistol grip in polymer / Flash hider, bolt catch, safety lever and pins in steel
• Total length : 700 to 780mm (5-position adjustable stock)
• Weight : 3075g
• Rails : 4 RIS/Picatinny rails — top rail 500mm + 3 handguard rails
• Tap-in thread : Left-hand (CCW) 14mm under flash hider — compatible with standard suppressors and tracers
• Quick detach sling swivel : QD end caps on handguard
• Battery : Not included — compatible stick NiMH or LiPo batteries in M4 stock format

Technical strengths - Construction and field performance

The BY-811 combines rarely seen technical features at this price point.

• V2 gearbox with 7mm steel ball bearings : The mechanical heart of the replica relies on a V2 gearbox mounted on 7mm steel ball bearings, offering superior longevity compared to plastic ring versions. This construction withstands repeated cycles without premature wear, directly reducing part failure risk.
• Tight bore 6,02mm internal barrel : A 6,02mm diameter over a 290mm length guides the pellet with less play than standard barrels, resulting in more repeatable trajectory and tighter groupings at distance. A concrete advantage over entry-level replicas equipped with 6.08mm barrels.
• No disassembly Quick Spring Change (QSC) system : The QSC system allows quick adjustment of the main spring without disassembling the gearbox. Changing power from field to field becomes a fast operation, achievable between games without specific tools.
• Functional steel bolt catch : The steel bolt catch facilitates direct access to the hop-up chamber without removing the upper cover. Adjusting backspin takes seconds, allowing optimization of pellet trajectory based on field and ammunition weight used.

Technical strengths - Modularity and accessory compatibility

The BY-811 is designed to accept market standards without adaptation.

• 4 standard RIS/Picatinny rails : The handguard exposes 4 Picatinny-format 20-22mm faces, compatible with all market accessories: tactical lights, lasers, vertical grips, bipods. No proprietary adapter is required.
• Left-hand 14mm thread : The flash hider detaches to reveal a left-hand (CCW) 14mm thread, a universal standard in airsoft. It accepts all market suppressors and modules without an adapter ring.
• 5-position adjustable stock : The retractable stock adjusts over 5 positions, allowing replica length adaptation to player build or carried equipment (tactical vest, ballistic protection).

Compatible with what ?

The Double Bell BY-811 is compatible with the M4/M416 standards of the airsoft market.

• Batteries stick NiMH or LiPo in M4 stock format (not included)
• Standard M4/M416 magazines (STANAG AEG)
• Suppressors and tracers with left-hand 14mm thread
• Picatinny/RIS 20-22mm rail accessories (lights, lasers, grips, bipods)
• Quick detach slings QD standard

Why you'll adopt it

• Metallic construction majority — immediate field durability
• Tight bore 6,02mm barrel — improved accuracy out of the box
• Quick Spring Change (QSC) system — power adjustability without disassembly
• High-capacity 300-bullet magazine — extended game play time
• 4 Picatinny rails — complete accessory compatibility without adapter
• Left-hand 14mm thread — compatible with standard suppressors and tracers

Equip yourself with a reliable and modular replica: the Double Bell BY-811 is now available.

Our field expert's opinion

'The BY-811 ticks all the right technical boxes: V2 gearbox on 7mm ball bearings, tight bore 6.02mm barrel and operational QSC — it’s a solid base you can keep for years without having to replace everything. The polymer hop-up and original motor are two areas to watch if you play intensively, but for regular outdoor use, the replica out of the box holds up well. We trust this kind of construction from Double Bell since several years.'